Find eeprom dump with know safe code for exact model of radio. I found my here with code 7273. We must compare this two, so we need make bin from hex dump of out eeprom. I used hex2bin, you need to compile it, just type make no need to install it.

Downloads/Hex2bin-1.0.10/hex2bin out.hex

after this i look in bin file with know safe code. I was grep-ing 7273, hex forms of this witout luck, then I realiaze there is 2737 ....